Roof Ridge Board Thickness

You may splice two boards together to achieve this length if necessary using a 14 and 1 2 inch block of the same material.

Roof ridge board thickness.

Typically 15 32 inch or thicker panels are required in high wind areas. This sizing guide for roof rafters will help determine what you need for your small project. Use panels rated as exposure 1 or better. Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm 400mm 450mm 600mm.

Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12. For 2 x 4 rafters use a 2 x 6 ridge board. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. For 2 x 6 rafters use a 2 x 8 ridge board and so on.

Ridge boards shall be at least 1 inch nominal thickness and not less in depth than the cut end of the rafter irc section r802 3. If your goal is to only calculate the roof height do not enter any numbers in wall height field and only use building width and roof pitch fields. Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance.